Fig. 1. Position of the photoelectric detection unit in the scattering light field

Fig. 2. Signal distribution and power spectrum of scattering light. (a) Particles with a particle size of 1 μm; (b) particles with a particle size of 100 μm

Fig. 3. F_γ（D）curve of scattered light distribution of particles. (a) Single particle size; (b) average particle size segment

Fig. 4. Lower limit of measurement for the ideal model. (a) Effect of noise on the lower limit of measurement; (b) effect of the refractive index of particles on the lower limit of measurement

Fig. 5. Resolving power of ideal model under different noise. (a) m_i =0; (b) m_i =0.1

Fig. 6. Effect of the real part of refractive index on resolving power (m_i=0.1)

Fig. 7. Experimental device approximate to ideal laser particle size analyzer

Fig. 8. Particle size measurement results of single-dispersed standard samples. (a) 50 nm; (b) 100 nm; (c) 200 nm; (d) 300 nm

Fig. 9. Particle size measurement results for samples with bimodal distribution. (a) 50 nm and 200 nm; (b) 100 nm and 200 nm; (c) 200 nm and 300 nm; (d) 300 nm and 400 nm